MCS 207 Solved Assignment 2021-22

MCS 207 Solved Assignment 2021-22

Course Code : MCS 207

Course Title : Database Management Systems

Assignment Number : PGDCA(2)/207/Assignment/2021-22

Maximum Marks : 100

Weightage : 25%

Last Dates for Submission : 15th November, 2021 (for July session)

MCS 207 Solved Assignment 2021-22 : All assignments are in PDF format which would be send on email/WhatsApp (9958676204) just after payment.

There are four questions in this assignment, which carries 80 marks. Rest 20 marks are for viva voce. You may use illustrations and diagrams to enhance the explanations. Please go through the guidelines regarding assignments given in the Programme Guide for the format of presentation. Answer to each part of the question should be confined to about 300 words. Make suitable assumption, if any.

Question 1:

(a) Explain the three level DBMS architecture with the help of an example. What is data independence? How can it be related to the three-level architecture?

(b) Explain the different types of constraints that can be defined in a relational database system with the help of examples. Why these constraints should be defined in a database system?

(c) What is a transaction? What are the problems of concurrent transactions? Explain with the help of examples.

(d) What is locking? Explain with the help of examples, how locking solves the problems relating to concurrent execution of transactions.

(e) Explain the concept of database recovery with the help of an example. Also, explain the concept of query optimisation with the help of an example.

Question 2:

A Medicine Store needs to maintain a database system for maintaining its inventory of items. The database is needed for the following requirements:

· To find the medicine name, medicine code, date of manufacture, date of expiry, present stock of medicine etc.

· To find the information about various suppliers of different medicines. A suppliermay not supply all the medicines. Some of the information that is needed about supplier is: the Supplier Code, supplier name, address, the medicines that can be supplied by the supplier etc.

· To find the information of various purchase orders of medicines purchase from various suppliers. Please note that one purchase order may include several medicines.

· To keep track of current stock of medicines, the quantity of medicines received and sold etc.

(a) Draw an ER diagram for the departmental store. Specify key attributes and constraints of each entity type and on each relationship type. Note any unspecified requirements, and make appropriate assumptions to make the specification complete.

(b) Design normalized tables in 3NFfrom the ER diagram drawn in part (a), with the required integrity constraints.

Question 3

Consider a “Software Management System” that maintains the database using the following tables:

Project (p-id, p-title, start-date, duration, proj-cost, c-id)

Clients (c-id, c-name, c-address, c-phone)

Employee (e-id, e-name, e-address, e-phone)

Project-person (p-id, e-id)

Please note that an employee may be working on more than one projects in the organization at a time. Write and run the following SQL queries on the tables:

a. Find the c-id and c-name of the clients who have given the project with maximum project cost.

b. List the employee id and name of all the employees and the project titles on which they have worked from time to time.

c. Find the list of employees who are working on at least two projects.

d. Find the names of all those employees who have worked on all the projects of client whose cname is “XYZ”.

e. Find the projects which have been completed between 31st Dec, 2020 and 31st Dec. 2021

f. Find the employees who are NOT working on any project.

g. List the project titles along with their p_id in the order of project cost.

h. List the Client details of the clients who have given a project after 31st Dec, 2021.

i. List the pairs of p-id’s of the employees, who are working on the same project.

j. List all the employees whose name starts with alphabet ‘S’.

Note: Make suitable assumptions, if any.

Question 4:

(a) Consider the Relation R={A, B, C, D, E, F} and the set of functional dependencies.

A→ BC B→E C→DF

What is the key of R? Decompose R into 2NF and 3NF relations.

(b) Differentiate between the following:

i. Object oriented database management systems and relational database management system

ii. Data mining and data warehousing

iii. NOSQL database and relational databases

MCS 207 Solved Assignment 2021-22, MCS 207 Solved Assignment 2021-22, MCS 207 Solved Assignment 2021-22, MCS 207 Assignment, IGNOU Assignment MCS 207 2021-22- Gandhi National Open University had recently uploaded the assignments of the present session for Programme for the year 2021-22. MCS 207 Solved Assignment 2021-22 Students are recommended to download their Assignments from this web page itself. They don’t got to go anywhere else when everything regarding the Assignments are available during this article only.

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MCS 207 Solved Assignment 2021-22 :- Those students who had successfully submitted their Assignments to their allocated study centers can now check their Assignment Status. Alongside --assignment status, they will also checkout their assignment marks & result. All this is often available in a web mode. After submitting the assignment, you'll check you MCS 207 Solved Assignment 2021-22 only after 3-4 weeks. MCS 207 Solved Assignment 2021-22 it'd take 40 days to declare MCS 207 Solved Assignment 2021-22

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